The Latest: IS oil production is greatly reduced since 2014

The U.S.-led coalition in Syria says the Islamic State group's oil production has been reduced to less than $4 million per month.

This July 30, 2017 photo, shows an oil field controlled by the Kurdish-led Syrian Democratic Forces (SDF), in Rmeilan, Hassakeh province, northeast Syria. The SDF, with air support from the U.S.-led coalition, said Sunday, Oct. 22, 2017 that they had captured the Al-Omar field, Syria's largest oil field, from the Islamic State group, marking a major advance against the extremists and for now keeping the area out of the hands of pro-government forces. (AP Photo/Hussein Malla)

That's from a peak of approximately $50 million per month since the coalition began operations against IS in 2014.

The statement to the AP came Sunday, when U.S.-backed fighters captured Syria's largest oil field from IS militants.

The Al-Omar oil field was a major source of income for the militant group and is considered one Syria's most productive.

The condition of the field, which has been controlled by IS for three years, was not clear following intense coalition and Russian airstrikes.

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7 p.m.

Russia's Defense Ministry says the Syrian city of Raqqa, formerly the self-declared capital of the Islamic State group, has been devastated as much as Dresden in World War II, and accuses the United States and its coalition partners of "barbaric" bombardment.

The U.S.-backed Syrian Democratic Forces claimed Friday to have taken control of Raqqa. The SDF is opposed to Syrian President Bashar Assad, whose army is supported by Russian forces.

In a statement Sunday, Defense Ministry spokesman Maj. Gen. Igor Konashenkov said thousands of civilians were killed in the battle for Raqqa. The city suffered "the fate of Dresden of 1945, which was erased by British-American bombardment," he said.

Western announcements of aid for Raqqa seek "to hide evidence of the barbaric bombing," Konashenkov added.

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4:30 p.m.

Syrian activists say a veteran Syrian opposition member who has been campaigning for the release of Syrian detainees has himself been detained.

The Syrian Observatory for Human Rights said Sunday Mohammed Saleh Abu Ali, in his 60s, has been detained at a checkpoint in the central city of Homs last Wednesday. A Facebook page for Syrian activists, Syrian News Activists, said Saturday he was detained from his home.

Syrian authorities don't comment on reports of detentions.

Abu Ali has been a government opponent since the 1980s, when he spent 12 years in prison as a member of the communist party. He was released in 2000, and was arrested again in 2015 for 17 months.

Abu Ali has been campaigning for the release of detainees. His detention comes amid a week-long hunger strike by hundreds in Homs' prison, calling for their release.

The Syrian Network for Human Rights, which tracks war detainees and casualties, has documented 85,000 Syrians that have been arbitrarily detained since the conflict began in 2011, 90 percent of them by the Syrian government which doesn't acknowledge their detention.

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3:20 p.m.

The U.S.-led coalition says allied fighters have captured Syria's largest oil field from the Islamic State group on Sunday, marking a major advance against the extremists in an area coveted by pro-government forces.

With IS in retreat, the Kurdish-led Syrian Democratic Forces and the Syrian government have been in a race to secure parts of the oil-rich Deir el-Zour province along the border with Iraq.

The SDF, with air support from the U.S.-led coalition, said Sunday it captured the Al-Omar field in a "swift and wide military operation." It said some militants have taken cover in oil company houses nearby, where clashes are underway. The U.S.-led coalition confirmed the SDF had retaken the oil field.

The Britain-based Syrian Observatory for Human Rights said pro-government forces retreated from the area around Al-Omar field after coming under heavy fire from IS. The SDF said government forces are three kilometers (two miles) away from the fields.

This July 30, 2017 photo, shows an oil field controlled by the Kurdish-led Syrian Democratic Forces (SDF), in Rmeilan, Hassakeh province, northeast Syria. The SDF, with air support from the U.S.-led coalition, said Sunday, Oct. 22, 2017 that they had captured the Al-Omar field, Syria's largest oil field, from the Islamic State group, marking a major advance against the extremists and for now keeping the area out of the hands of pro-government forces. (AP Photo/Hussein Malla)